in Body Fluids and Circulation (Cardiovascular System, Circulatory system) by

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The straw colored fluid portion of the blood is called as plasma. Plasma forms 50% of human blood.
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The straw-colored fluid is the PERICARDIAL FLUID, which is secreted by the serous visceral pericardium. This fluid is present in the pericardial cavity (It is the space between to pericardial layers).
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